Order Decapoda Latreille, 1802.
Infraorder Caridea Dana, 1852.
Family Bresiliidae Calman, 1896.
2.2. Description
Body (
Figure 1a,e) moderately slender, subcylindrical, integument firm, tegumental scales present in semi-regular patterns (
Figure 1b), but mostly represented by pits. Rostrum (
Figure 1a–c) slender, straight, about 0.75–0.80 times carapace length, reaching to distal margin of second article of antennular peduncle; dorsal margin with 5–6 relatively small teeth, all anterior to orbital margin, posterior-most tooth basally articulated (in holotype only); ventral margin straight, armed with single subdistal, small tooth; lateral carina well developed, distinct from orbit throughout its length; suborbital lobe distinct, not protruding.
Thoracic sternum very narrow (not illustrated); sternite 3 with anteriorly directed, sharp tooth; sternite 4 with low median carina; sternite 5 with paired moderately well-developed teeth; sternite 6 with pair of long, slender, acute processes; sternite 7 with paired, moderately well-developed teeth; sternite 8 with slenderer, submedian process.
Figure 1.
Bresilia scintilla sp. nov.; (a) carapace and frontal appendages, lateral view; (b) same; (c) frontal margin and appendages, dorsal view; (d) rostrum, lateral view; (e) abdomen, lateral view; (f) telson, dorsal; (g) epistome; (h) mandible, (i) maxillule, (j) maxilla; (k) first maxilliped; (l) second maxilliped; (m) third maxilliped; (n) same, distal segment; (o) uropod (a,e–o) (paratype, RMNH.CRUS.D.59337); (b–d) (holotype, RMNH.CRUS.D.59336).
Figure 1.
Bresilia scintilla sp. nov.; (a) carapace and frontal appendages, lateral view; (b) same; (c) frontal margin and appendages, dorsal view; (d) rostrum, lateral view; (e) abdomen, lateral view; (f) telson, dorsal; (g) epistome; (h) mandible, (i) maxillule, (j) maxilla; (k) first maxilliped; (l) second maxilliped; (m) third maxilliped; (n) same, distal segment; (o) uropod (a,e–o) (paratype, RMNH.CRUS.D.59337); (b–d) (holotype, RMNH.CRUS.D.59336).
Figure 2.
Bresilia scintilla sp. nov.; (a) right first pereiopod (paratype), lateral; (b) same, mesial; (c) same, chela, mesial; (d) same, chela, lateral; (e) same; (f) right first pereiopod (holotype), lateral; (g) same, carpus, mesial; (h) same, chela, lateral; (i) same, chela, distal, mesial; (j) right second pereiopod, lateral; (k) same, chela, lateral; (l) right third pereiopod, lateral; (m) same, ischium; (n) same, dactylus; (o) right fourth pereiopod; (p) same, ischium; (q) same, dactylus; (r) right fifth pereiopod; (s) same, dactylus; (a–e) (paratype, RMNH.CRUS.D.59337); (f–s) (holotype, RMNH.CRUS.D.59336).
Figure 2.
Bresilia scintilla sp. nov.; (a) right first pereiopod (paratype), lateral; (b) same, mesial; (c) same, chela, mesial; (d) same, chela, lateral; (e) same; (f) right first pereiopod (holotype), lateral; (g) same, carpus, mesial; (h) same, chela, lateral; (i) same, chela, distal, mesial; (j) right second pereiopod, lateral; (k) same, chela, lateral; (l) right third pereiopod, lateral; (m) same, ischium; (n) same, dactylus; (o) right fourth pereiopod; (p) same, ischium; (q) same, dactylus; (r) right fifth pereiopod; (s) same, dactylus; (a–e) (paratype, RMNH.CRUS.D.59337); (f–s) (holotype, RMNH.CRUS.D.59336).
Figure 3.
Bresilia scintilla sp. nov. SEM images, (a) right first pereiopod, chela, lateral; (b) same, occluding margin; (c) same, detail of fossae; (d) same, recurved teeth on pollex; (e) same, compressed tooth on dactylus; (f) left first pereiopod, chela, mesial; (g) same, detail; (h) same, compressed tooth on dactylus; all from paratype (RMNH.CRUS.D.59337).
Figure 3.
Bresilia scintilla sp. nov. SEM images, (a) right first pereiopod, chela, lateral; (b) same, occluding margin; (c) same, detail of fossae; (d) same, recurved teeth on pollex; (e) same, compressed tooth on dactylus; (f) left first pereiopod, chela, mesial; (g) same, detail; (h) same, compressed tooth on dactylus; all from paratype (RMNH.CRUS.D.59337).
Figure 4.
Habitat and colour pattern; (a) exit of lava tube “Palmeira 1”; (b) unidentified tunicates and sponges on wall of lava tube; (c) Janicea antiguensis, a common shrimp species in Cabo Verdean lava tubes; (d) live colour pattern of Bresilia scintilla sp. nov., shortly after capture (paratype, RMNH.CRUS.D.59337); (e) same (holotype, RMNH.CRUS.D.59336).
Figure 4.
Habitat and colour pattern; (a) exit of lava tube “Palmeira 1”; (b) unidentified tunicates and sponges on wall of lava tube; (c) Janicea antiguensis, a common shrimp species in Cabo Verdean lava tubes; (d) live colour pattern of Bresilia scintilla sp. nov., shortly after capture (paratype, RMNH.CRUS.D.59337); (e) same (holotype, RMNH.CRUS.D.59336).
Carapace with antennal tooth only, hepatic, branchiostegal and pterygostomial teeth absent; antennal tooth (
Figure 1a,b) short, not merged with orbit; Pterygostomial angle semi-quadrate, not developed into a tooth. Pleon (
Figure 1e) smooth; third segment produced posteriorly, but not markedly elevated or crested; pleura 1–3 posteriorly broadly rounded, pleuron 4 with posteroventral angle quadrate; pleuron 5 with posteroventral angle produced into distinct tooth; pleuron 6 with polygonal lobe above articulation with uropod, posteromedian corner of lobe forming short, posteriorly directed tooth; ventrolateral corner of pleura angulate.
Telson (
Figure 1f) about 3 times as long as wide, with 5 pairs of dorsolateral spiniform setae, all placed slightly submarginally; posterior margin slightly convex, furnished with 3 pairs of spiniform setae, lateral pair shortest, submedial pair longest. Epistome (
Figure 1g) with long, slender median process. Eyestalk (
Figure 1a–c) subpyriform, cornea not dilated, not wider than eyestalk, Nebenauge present, small.
Antennular peduncle (
Figure 1a–c) falling short of (paratype) or slightly over-reaching (holotype) scaphocerite; first article about same length as two distal segments combined; stylocerite not abutting, tapering to acute tip, reaching to distal margin of first article; outer flagellum uniramous, longer than peduncle, aesthetascs present on distal 2–3 subdivisions; mesial flagellum much longer than and more slender than lateral flagellum. Antennal peduncle (
Figure 1a,b,g) with stout basicerite, ventrolateral and ventrodistal tooth present; carpocerite stout; scaphocerite well developed, blade-like, about 2.5 times as long as maximal width, lateral margin straight, distolateral tooth slender, falling well short of distal margin of lamella; flagellum broken.
Mouthparts as illustrated (
Figure 1h–n); without noteworthy features, as usual for genus.
First pereiopod (
Figure 2a–i) over-reaching distal margin of scaphocerite by majority of palm; articulation between basis and ischium distinct; ischium somewhat widening distally, distoventral angle produced into blunt tooth; merus subcylindrical, unarmed; carpus short, cup-like, ventro- and dorsomesial angles bluntly produced; dorsolaterally furnished with single, long, plumose seta; ventromedial margin with two spiniform seta; carpo-propodal brush poorly developed; chela slender, palm oval in cross-section, not increasing in depth distally, unadorned, single spiniform seta present at midpoint of flexor margin; fingers somewhat deflexed, forming deep cavity on lateral surface (
Figure 3a), terminating in acute tips; cutting edge of fixed finger with distinct chitinous ridge (
Figure 3b), provided with deep fossae (
Figure 3b,c) to accommodate flattened teeth on cutting edge of dactylus (
Figure 3g); submarginally furnished with series of squamate, closely abutted seta (
Figure 3a,b,d); dactylus sinuous (
Figure 2i), over-reaching fixed finger, tip upturned, cutting edge pectinate, consisting of flattened teeth; exopod flagellum-like, not reaching distal margin of merus.
Second pereiopod (
Figure 2j,k) slender, over-reaching distal margin of scaphocerite by length of chela; ischium with four elongated, spiniform setae on lateral face; merus distinctly longer than ischium, with linear row of five elongated, spiniform setae on lateral face; carpus about 0.35 times as long as chela, unarmed; chela elongate, palm subcylindrical, unadorned; fixed finger somewhat excavated on outer side, spinulate cutting edge; dactylus similar, more cylindrical; exopod flagellum-like, reaching to midlength of merus.
Third to fifth pereiopods slender, similar in form, lacking exopods. Third pereiopod (
Figure 2l–n) over-reaching distal margin of scaphocerite by length of dactylus; ischium with single spinule on lateral surface ventrally; merus about 1.5 times as long as ischium, unarmed; carpus shorter than merus, cylindrical, unarmed; propodus about 3.2 times as long as carpus, single spinule along flexor margin in distal portion, single spinule present at distoventral corner; dactylus about 0.24 times as long as propodus, weakly curving, terminating in long unguis, furnished with 6 evenly distributed, accessory spinules on flexor margin. Fourth pereiopod (
Figure 2o–q) similar in proportions; ischium with two spinules; propodus unarmed; dactylus similar. Fifth pereiopod (
Figure 2r,s) similar in proportions; ischium and propodus unarmed.
Pleopods (not illustrated) without distinctive features, male pleopods unknown.
Uropods (
Figure 1o) slightly over-reaching tip of telson; protopod posterolaterally sharply pointed; endopod slender, somewhat tapering distally; exopod of same length, diaeresis distinct in lateral part, with small posterolateral tooth and much longer, well-developed spinule mesial to tooth; distal lamella quadrate.
Eggs (about 25 in holotype) ovoid in shape, non-eyed, size approximately 0.3 × 0.5 mm.