Admirandus odishaensis Patra, Choudhury and Patro, 2025

Admirandus odishaensis Patra, Choudhury and Patro sp. n.

( Figures 1–2 View Figure 1 View Figure 2 , Table 1)

Type materials

Three males and three females.

Holotype male (slide ZSI/ EBRC /N-17070)

Paratypes

Two paratype males (on slide ZSI/ EBRC /N-17071 and ZSI/ EBRC /N-17072) and three paratype females slide ZSI/ EBRC /N-17073, ZSI/ EBRC /N-17074 and ZSI/ EBRC /N-17075 ).

Type locality

Samples were collected from the sandy substrate in the outer channel of Chilika Lagoon , Odisha, 42.534’N, 85°34.501’E), on 21 November 2023 .

Habitat

The species inhabits sandy marine environments in the Chilika Lagoon, particularly in the outer where the lagoon connects with the Bay of Bengal. At the time of collection, the salinity in this region recorded as 24 PSU.

Etymology

The species epithet is derived from the name of the Indian state ‘Odisha’, where the specimens collected.

Description

Males. Body elongated, cylindrical, with smooth cuticule. Cephalic region narrower than remainder body. Labial and cephalic sensilla papilliform. Buccal cavity large, approximately three times longer wide. Buccal cavity with three teeth: two ventrosublateral and one dorsal. Right ventrosublateral largest; left ventrosublateral tooth approximately 1 μm longer or shorter than dorsal tooth. Amphidial pocket-shaped; diameter-to-length ratio 1.4–1.6. Amphidial fovea situated in anterior half of buccal Secretory-excretory pore located posterior to buccal cavity, at 2.3–2.7% of body length from anterior Pharynx 14% of total body length. Nerve ring located anterior to mid-pharynx. Diorchic with opposed vas deferens 1015–1055 μm long, extending from posterior of testis to cloacal region along right to

Body slightly constricted anterior to cloaca and widened posterior to cloacal opening. Spicules 1.0–1.2 cloacal body diameters long. Gubernaculum curved, parallel to spicules, 0.3 times spicule Cloacal region with two rows of setae. Three caudal glands and spinneret present. Sparse caudal present in conical portion of tail. Tail conical anteriorly, cylindrical posteriorly, with narrowed cloacal

Females. Similar to males. Amphidial fovea diameter-to-length ratio 1.6‒1.8. Secretory-excretory located posterior to buccal cavity, at 1.9‒2.7% of body length from anterior end. Pharynx 12‒15% body length. Vulva located at midbody. Two antidromously reflected ovaries. Demanian system

HISTORY of the demanian system. B: External pores of demanian system; arrows indicate three external pores and the main

Buccal cavity of male. D: Tail region of male.

Diagnosis

Cephalic region narrower than remainder of body. Sexual dimorphism in tail shape: anterior portion conical in males, not conical in females. Demanian system with three external pores in tail region. supplements absent. Gubernaculum short. Pharynx length 318–355 μm. Buccal cavity length-to-width 3.0–3.2.