Tirmilyra sagittifera ( Alcock, 1896 ) Patel & Naderloo & Trivedi & Mitra, 2023

Patel, Krupal, Naderloo, Reza, Trivedi, Jigneshkumar & Mitra, Santanu, 2023, On the taxonomy of Philyra sagittifera (Alcock, 1896) and P. concinnus Ghani & Tirmizi, 1995 (Decapoda, Brachyura, Leucosiidae), with description of a new genus from the Indian Ocean, Zootaxa 5330 (3), pp. 430-440 : 434-436

publication ID	https://doi.org/ 10.11646/zootaxa.5330.3.6
publication LSID	lsid:zoobank.org:pub:D8D32782-EE8C-4946-A873-F25F6F923FC6
DOI	https://doi.org/10.5281/zenodo.8257346
persistent identifier	https://treatment.plazi.org/id/03AB87CE-FFFE-FF81-5C85-8637FFF3FD0A
treatment provided by	Plazi
scientific name	Tirmilyra sagittifera ( Alcock, 1896 )
status	comb. nov.

Treatment

Tirmilyra sagittifera ( Alcock, 1896) View in CoL n. comb.

( Figs. 1A–D View FIGURE 1 , 2A, B View FIGURE 2 , 3A, B View FIGURE 3 , 4A–D View FIGURE 4 )

Ebalia sagittifera Alcock, 1896: 186 View in CoL (in key), 188, 189— Alcock & Anderson 1897: pl 29, fig 9— Apel 2001: 50.

Ebalia? Sagittifera View in CoL — Titgen, 1982: 113, 247 (in list)— Cooper 1997: 173, 174, fig 7.

Philyra rectangularis View in CoL — Stephensen, 1946: 87, 88, fig 15a, b— Guinot 1967: 249 (in list)— Basson et al. 1977: 250.

Philyra concinnus View in CoL — Ghani & Tirmizi, 1995: 143–147, fig 2a–e (in part, material from Persian Gulf).

Philyra sagittifera View in CoL — Ng et al. 2008: 93 — Galil 2009: 281, tab 1— Naderloo & Türkay 2012: 32 — Naderloo 2017: 112, figs. 14.35d, 14.38, 14.41.

Type material. Lectotype (herein selected): ZSI C910/10, male (CL 5.0 mm, CW 4.5 mm), Karachi, Pakistan, coll. F. W. Townsend. Paralectotype: ZSI C910/10, female (CL 6.0 mm, CW 5.7 mm), same data as lectotype.

Other material examined. Persian Gulf: ZUMC CRU885 , 1 male (CL 4.2 mm, CW 3.9 mm), 6 m depth, Bushehr, Iran, 03.03.1993, coll. G. Thorson ; ZMUC CRU-885 , 2 males, 3 ovigerous females, 6 m depth, Bushehr , Iran, 03.03.1993, coll. G. Thorson; ZUTC 1339 , 1 juvenile, muddy-sandy flat, E of Bandar-Abbas , Iran, 27°11′N, 56°21′E, coll. Reza Naderloo, Abbas Kazemi; ZUTC 1340 , 1 male, muddy flat, E of Bandar-Khamir GoogleMaps , Iran, 27°56′N, 55°36′E, coll. Reza Naderloo; SMF, 1 male, 3 juveniles (), N. of Al-Khobar , Tarut Bay GoogleMaps , Saudi Arabia, 19.03.1993, coll. Michael Apel; SMF, 8 males, 6 ovigerous females, N. of Al-Khobar , Tarut Bay , Saudi Arabia, 25.03.1993, coll. Michael Apel; SMF, 1 juvenile, intertidal, N. of Jubail , Saudi Arabia, 30.04.1993, coll. Michael Apel; SMF, 1 male, 6 m depth, Qurmah Channel, N. of Jubail , Saudi Arabia, 05.10.1992, coll. Michael Apel.

Description. Carapace hexagonal ( Fig. 1A, B View FIGURE 1 ), slightly longer than broad. Dorsal surface smooth, three broad tuberculated and granular ridges, uniting to form "broad-arrow" point directed forward, median ridge from progastric region to intestinal region; lateral ridges extending backwards and downwards to branchial region, parallel to anterolateral margins with their ends projecting beyond postero-lateral borders in forming broad granular denticles; regions relatively distinct, with elevated gastric, cardiac, branchial, intestinal regions; hepatic region excavated, forming depression; upper, lower margins beaded, originating from middle of anterolateral margin, not merging anteriorly, broadly triangular tooth projecting on anterior half of lower margin of anterolateral border ( Fig. 1A, B View FIGURE 1 ); anterolateral margin merging with posterolateral with broad triangular tooth; anterolateral, posterolateral, posterior margins beaded; epibranchial junction with right angle; posterolateral margin slightly sinuous, convex ( Fig. 1A, B View FIGURE 1 ); front bilobed; epistome visible beyond frontal margin from dorsal view; posterior margin convex, lateral sides with knob-like dorsoventrally flattened teeth with rounded tips, small median tooth on posterior margin ( Fig. 1A, B View FIGURE 1 ). Anterior margin of endostome almost reaching as far forwards as inhalent channels.

Maxilliped 3 ( Figs. 1D View FIGURE 1 , 4A View FIGURE 4 ) smooth, entirely covering endostome; merus with notch, 0.9× as long as ischium along inner margin; ischium 1.4× longer than wide; propodus, dactylus not visible in external view when reposed, articulating on inner surface of merus. Exopod outer margin convex, setose, much longer than wide, almost twice as long as merus.

Chelipeds ( Fig. 1A, B View FIGURE 1 ) equal, longer than half of carapace length, granulated. Merus triquetral in cross-section with edges raised, granular; both inner, outer margins with tuberculated ridge, tubercles larger on inner margin, patch of tubercles on upper proximal and distal end. Carpus, propodus have raised row of granules along inner edge of upper surface. Fingers slender, about two-thirds length of propodus, occlusal margins of fingers toothed, with scattered setae, median shallow canal extending to distal length in both fingers.

P2–P5 ( Fig. 1A, B View FIGURE 1 ) subcylindrical; total length of all pairs almost similar, merus, carpus glabrous, merus longest; carpus, propodus almost equal in length; dactylus with tapering distal end.

Thoracic sternum ( Fig. 1D View FIGURE 1 ) tuberculated, slightly concave, tubercules prominent at margins. Sternites 1–3 completely fused without any trace of sutures; sternite 3 separated from sternite 4 by shallow groove; sternite 4–6 almost similar in width; sternite 7 completely tuberculated.

Male pleon long, narrow ( Fig. 1D View FIGURE 1 ), smooth, with three articulating parts ( Fig. 1D View FIGURE 1 , 4B View FIGURE 4 ): somite 1 free, narrow; somites 2–6 fused, immovable, partial suture visible between somites 5–6, posterolateral angles with small bulge, somite 6 without denticle; telson triangular, longer than broad, with curved apex.

Female pleon ovate; somite 1 free; somites 2–6 fused, suture clearly visible between somites 2 and 3, partial suture visible between somites 3–4 and 5–6, forming domed plate almost completely covering thoracic sternum. Telson longer than broad, with curved apex ( Fig. 2B View FIGURE 2 ).

G1 ( Fig. 4A–D View FIGURE 4 ) shaft long, slender, straight, apical process long, about 0.3 times as long as whole length, slightly sinuous-shape, with tapering ending, apical lobe with setae shorter than the length of the tip. Female gonopore ( Fig. 5B View FIGURE 5 ) on inner anterior edge of sternite 5, oval in shape with narrow opening.

Variation. The carapace of female resembles with that of male, except for lateral sides of posterior margin having smaller knob-like dorsoventrally flattened teeth, small median tooth on posterior margin less pronounced or absent ( Fig. 2A View FIGURE 2 ).

Distribution. The species is recorded so far from Pakistan ( Alcock 1896), the Persian Gulf [ Stephensen (1946) as Philyra rectangularis ; Basson et al. (1977) as P. rectangularis ; Titgen (1982) as Ebalia sagittifera ; Cooper (1997) as E. sagittifera ; Apel (2001) as E. sagittifera ; Naderloo and Türkay (2012); Nadeloo (2017)] and the Gulf of Oman ( Naderloo et al. 2015).

Remarks. The fresh specimens collected from the Persian Gulf agree with the lectotype of T. sagittifera n. comb. The male specimen collected from the Persian Gulf ( Fig. 1A View FIGURE 1 ) differs from the lectotype male by having smaller blunt teeth on the lateral sides of posterior margin as well as prominently swollen cardiac region. These differences can be attributed to differences in the body size of the male specimens.

Tirmilyra sagittifera n. comb. closely resembles its congener T. concinnus n. comb., but they can be differentiated on the basis of the following characteristics: dorsal surface of carapace without denticle on the metagastric region ( Fig. 1A, B, D View FIGURE 1 ) (versus denticle present on the metagastric region of carapace in T. concinnus n. comb., Fig. 1E View FIGURE 1 ; Ghani & Tirmizi 1995: Fig. 1A View FIGURE 1 ); posterior margin slightly convex ( Fig. 1A, B, D View FIGURE 1 ) (versus straight in T. concinnus n. comb., Fig. 1E View FIGURE 1 ; Ghani & Tirmizi 1995: Fig. 1A View FIGURE 1 ); posterior margin bearing median tooth in males ( Fig. 1A, B, D View FIGURE 1 ) (versus median tooth absent in males in T. concinnus n. comb., Fig. 1E View FIGURE 1 ; Ghani & Tirmizi 1995: Fig. 1A View FIGURE 1 ); blunt teeth present on the lateral sides of posterior margin ( Figs. 1A, B, D View FIGURE 1 ) (versus pointed teeth on lateral sides of posterior margin in T. concinnus n. comb., Fig. 1E View FIGURE 1 ; Ghani & Tirmizi 1995: Fig. 1A View FIGURE 1 ); thoracic sternum tuberculated, prominent at margins ( Fig. 1C View FIGURE 1 ) (versus thoracic sternum smooth, tuberculation only on margins in T. concinnus n. comb., Fig. 1F View FIGURE 1 ); male G1 apical process comparatively long (0.3× as long as whole length), slightly sinuous-shape, with tapering ending ( Fig. 4A–D View FIGURE 4 ) (versus apical process comparatively short (0.2× as long as whole length), more sinuous-shape, with spatulate ending in T. concinnus n. comb., Fig. 4E, F View FIGURE 4 ; Ghani & Tirmizi 1995: Fig. 1E, F View FIGURE 1 ), endostome almost reaching inhalent channels ( Fig. 5A View FIGURE 5 ) (versus endostome reaching slightly beyond inhalent channels in T. concinnus comb. nov. Fig. 5C View FIGURE 5 )