Lissosabinea lynseyae, Taylor & Collins, 2009

Taylor, Joanne & Collins, David J., 2009, New records of the shrimp genus Lissosabinea (Caridea: Crangonidae) from Australia including descriptions of three new species and a key to world species., Memoirs of Museum Victoria 66 (1), pp. 175-187 : 186

Lissosabinea lynseyae sp. nov.

Figures 5–6, 8 .

Sabinea sp. mov 5421.— Poore et al., 2008: 82.

Type material. Holotype. Australia, WA, off Bunbury (33°00.5' S, 114°59.26' E – 33°00.11' S, 114°34.50' E), 421– 414 m, 20 Nov 2005 (stn SS10-2005 13), WAM C42465 (female specimen, cl. 5.5 mm).

Etymology. Named for Lynsey Poore. Her enthusiastic support of Gary’s crustacean research over many decades has benefited all members of the Marine Invertebrate Department.

Type locality. Bunbury , Western Australia, 414–421 m.

Distribution. Known only from type location.

Description. Based on holotype female.

Rostrum straight, directed forward, relatively broad, slightly overreaching distal margin of first segment of antennular peduncle; distal part spiniform, broadened with ventral blade; dorsal surface with low, blunt median ridge, bearing scattered setae extending onto anterior part of carapace; lateral tooth strong arising from 0.58 of rostrum; ventral margin straight, unarmed.

Carapace 1.90–2.20 times as long as wide. Middorsal carina sharp, extending nearly to posterodorsal margin of carapace, armed with two teeth; epigastric tooth falling far short of base of rostrum arising at 0.21 of carapace length; second tooth arising from 0.65 of carapace length. Dorsal surface of carapace with few irregularly scattered setae. Antennal tooth small, not reaching anterior margin of cornea of eye. Branchiostegal tooth directed forward, falling short of anterior margin of antennal basicerite. Pterygostomian angle with tooth. Lateral face of carapace with relatively large hepatic and one post hepatic tooth, but epibranchial tooth absent; epibranchial carina conspicuous.

Fifth thoracic somite without sternal tooth in spawning female.

Second abdominal somite smooth on dorsal surface. Third somite with middorsal carina in posterior 0.33; posterodorsal margin of somite moderately produced posteriorly, partially covering fourth somite. Sixth somite about 2.00 times as long as high; dorsal surface flat on midline. Telson with two pairs of minute dorsolateral spines; posterolateral angle with one short blunt spine and two pairs of longer spines (broken); terminal process acutely pointed.

Antennular peduncle reaching 0.55 of antennal scale; stylocerite not reaching distal margin of first segment. Antennal scale about 0.68 of carapace length and 2.70 times as long as wide, lateral margin slightly curved, distal blade rounded; basicerite with ventrolateral spine reaching mid point of first segment of antennular peduncle.

Mouthparts not dissected.

First pereopod with palm about 3.50 times as long as wide; cutting edge of palm strongly oblique; pollex relatively large, triangular, not recurved; carpus armed with two large spines on lateral margin; merus with very strong dorsodistal spine not overreaching distal margin of anteriorly extended carpus, distolateral margin with small blunt tooth; ventral lamina terminating distally in large acute tooth. Second pereopod not reaching mid-length of merus of first pereopod; dactylus about 0.40 length of propodus; propodus not weakly widened distally. Third pereopod slender; ischium 2.56 times as long as merus. Fourth pereopod moderately slender, overreaching antennal scale by length of dactylus and 0.70 of propodus; dactylus compressed laterally, about 0.51 times as long as propodus, propodus with distal tuft of setae; carpus 0.61 times as long as propodus; merus about eleven times as long as wide, unarmed on dorsodistal margin; ischium 0.48 times as long as merus. Fifth pereopod similar to fourth, overreaching antennal scale by length of dactylus and 0.70 of propodus; ischium 0.45 times as long as merus.

Colour. The pereopods, ventral half of carapace and ventral half of abdominal somites are pigmented red. The rostrum and dorsal carapace are green pigmented in life.

Remarks. L. lynseyae sp. nov. can be distinguished from the other species known from Australia by the shape of the third abdominal somite and the long slender dactylus of pereopod 4 which is more than half the length of the propodus.

Figures

Figure 8. Live animal photographs of Lissosabinea copyright CSIRO. A, Lissosabinea beresfordi sp. nov., holotype male J57989, lateral view; B, dorsal view. C, Lissosabinea lynseyae sp. nov. lateral view, holotype female, cl. 5.5 mm, J54492.