Torbenella lupi Macpherson, Rodríguez-Flores, and Machordom 2023
- Dataset
- Integrative approach to describe new species of squat lobsters of the genera Heteronida Baba & de Saint Laurent, 1996 and Torbenella Baba, 2008 (Decapoda, Munididae) from the Southwestern Pacific Ocean
- Rank
- SPECIES
- Published in
- Macpherson, Enrique, Rodríguez-Flores, Paula C., Machordom, Annie (2023): Integrative approach to describe new species of squat lobsters of the genera Heteronida Baba & de Saint Laurent, 1996 and Torbenella Baba, 2008 (Decapoda, Munididae) from the Southwestern Pacific Ocean. European Journal of Taxonomy 860 (1): 116-140, DOI: 10.5852/ejt.2023.860.2055, URL: http://dx.doi.org/10.5852/ejt.2023.860.2055
Classification
- kingdom
- Animalia
- phylum
- Arthropoda
- class
- Malacostraca
- order
- Decapoda
- family
- Munididae
- genus
- Torbenella
- species
- Torbenella lupi
description
Description CARAPACE. Slightly wider than long. Transverse ridges usually interrupted, except several on gastric region and posterior part of carapace, with dense very short setae. Main transverse striae on posterior part of carapace interrupted in cardiac region. Scales and secondary striae absent between main striae. Gastric region with 2 main epigastric spines each behind supraocular spine; with row of 4 – 5 minute flanking spines and some small spines at base of rostrum and in parahepatic, hepatic and anterior branchial regions; one small postcervical spine on each side. Orbit with lateral limit weakly defined. Frontal margins concave. Lateral margins slightly convex. Anterolateral spine well developed, at anterolateral angle, reaching level of sinus between rostrum and supraocular spines. One or 2 very small marginal spines anterior to cervical groove. Branchial margins with 4 (rarely 5) small spines. Rostrum spiniform, less than half as long as remaining carapace, not exceeding end of corneae, carinated dorsally, straight, and directed slightly upwards. Supraocular spines barely reaching midlength of rostral spine and falling short of end of corneae, subparallel, directed slightly upwards. THORACIC STERNUM. Smooth, without striae, except a few on sternite 4. Sternite 3 2.5 times as wide as long; sternite 4 2.8 times as wide as long, and 2.3 times as wide as sternite 3. Anterior part of sternite 4 slightly narrower than sternite 3; anterior margin widely contiguous to sternite 3. ABDOMEN. Somites 2 – 4 with 2 median spines on anterior ridge; posterior ridge of somite 4 with small median spine. Somites 2 – 3 each with 3 transverse ridges and several scales in addition to anterior ridge. Somite 4 with a few striae. EYES. Eyes large, maximum corneal diameter 0.4 times distance between bases of anterolateral spines. ANTENNULE. Article 1 (distal spines excluded) about one-third carapace length, elongate, barely reaching end of corneae, with 2 short distal spines, mesial spine shorter than lateral spine; lateral margin unarmed, bearing numerous long plumose setae. ANTENNA. Article 1 with prolonged, strong mesial process exceeding antennular peduncle, lateral border with numerous long plumose setae; article 2 with 2 distal spines, distomesial longer than distolateral, barely reaching end of article 3; article 3 with distomesial spine, article 4 unarmed. MXP 3. Ischium about 1.5 times length of merus, distoventrally produced to spine. Merus with welldeveloped median spine on flexor margin, extensor margin unarmed. P 1. 2.5 – 3 times carapace length, squamous, with dense short setae on scales, with scattered long setae. Merus 1.3 – 1.5 times carpus length, armed with some mesial spines, distalmost strongest. Carpus slightly longer than palm, 3 times as long as wide, with several spines along mesial margin. Palm slightly longer than fingers, with few small spines on mesial border. Fingers unarmed, distally curving and crossing, ending in sharp point. P 2 – 4. Moderately long and slender, squamous, with dense short setae on scales, with some long iridescent setae along extensor margins of all articles. P 2 twice carapace length. Meri successively shorter posteriorly (P 3 merus 0.8 times length of P 2 merus, P 4 merus 0.8 times length of P 3 merus); P 2 merus 0.8 times carapace length, 4.5 – 5.0 times as long as wide, 1.7 times as long as P 2 propodus; P 3 merus 4.0 – 4.5 times as long as wide, 1.5 times as long as P 3 propodus; P 4 merus 3.5 – 4.0 times as long as wide, 1.3 times as long as P 4 propodus. Extensor margins of meri with row of small, proximally diminishing spines on P 2 – 3, distal spine only on P 4; flexor margins with distal spines followed proximally by several eminences; lateral sides unarmed. Carpi with several spines on extensor margin; flexor margin ending in blunt point. Propodi 4.0 – 4.5 times as long as wide; extensor margin unarmed; flexor margin with 4 – 5 slender movable spines, without fixed distal spine. Dactyli slender, length 0.9 times that of propodi; flexor margin with 2 median movable spinules; P 2 dactylus 5.5 times as long as wide. Genetic data Partial genes of COI, 18 S and PEPCK were successfully sequenced. As usual, the COI sequence showed the highest levels of divergence, 4.86 % comparing T. aequabilis sp. nov. and T. orbis, and 15.42 % to T. calvata. Torbenella lupi sp. nov. formed a well-supported cluster (pp = 1) with T. aequabilis and T. orbis (Fig. 7).
description
urn: lsid: zoobank. org: act: FE 41 E 3 F 0 - 3236 - 4 B 3 D-AB 95 - CC 190 C 43 A 233 Fig. 4 Torbenella aff. orbis 1. — Machordom et al. 2022: table 2.
discussion
Remarks The new species is morphologically closely related to T. orbis (Baba, 2005) and T. mensae sp. nov., sharing the presence of median spines on the anterior ridge of the abdominal somite 2. Characters distinguishing the three species are outlined under the Remarks of T. mensae (see below).
distribution
Distribution Papua-New Guinea, between depths of 269 and 340 m.
etymology
Etymology The name ‘ lupi ’ refers to one of the southern hemisphere constellations (the Wolf).
materials_examined
Material examined Holotype PAPUA-NEW GUINEA • ov. ♀ (10.2 mm); KAVIENG stn CP 4418; 02 º 27 ′ S, 150 º 40 ′ E; 335 – 340 m depth; 28 Aug. 2014; GenBank no.: COI: OP 215693, 18 S: OP 196289, PEPCK: OP 252566; MNHNIU- 2014 - 10024. Paratypes PAPUA-NEW GUINEA • 3 ♂♂ (6.5 – 8.0 mm), 3 ov. ♀ (7.5 – 8.0 mm), 1 ♀ (5.9 mm); KAVIENG stn DW 4495; 02 º 24 ′ S, 149 º 55 ′ E; 272 – 274 m depth; 6 Sep. 2014; MNHN-IU- 2014 - 9900 • 1 ♀ (7.2 mm); KAVIENG stn CP 4496; 02 º 25 ′ S, 149 º 54 ′ E; 269 – 274 m depth; 6 Sep. 2014; MNHN-IU- 2014 - 13983.