taxonID	type	description	language	source
2A248796FFFDB170FC08BE89BAE7F494.taxon	description	Figs 2 A, B, 3.	en	Ahmed, Quratulan, Ali, Qadeer Mohammad, Marin, Ivan N., Mubarak, Shumaila, Baloch, Ateeqa (2025): First record of Clausidium sarii (Copepoda: Clausidiidae) from the coastal waters of Pakistan, with the first description of the male and a new host. Arthropoda Selecta 34 (1): 41-50, DOI: 10.15298/arthsel.34.1.03
2A248796FFFDB170FC08BE89BAE7F494.taxon	materials_examined	MATERIAL EXAMINED. ♂, Cat no. MRCC-UOK-THAL- 02, Northern Arabian Sea, Pakistan, along the Karachi coast, Buleji, 24 ° 50 ′ 20.41 ″ N 66 ° 49 ′ 24.15 ″ E, soft bottom habitats, collected with a hand net under rock boulder, 23 January 2023. BRIEF DESCRIPTION. Body long with yellowish translucent. Carapace whitish with tinge of yellowish on rostrum to post-rostral area and transverse band of similar color medially on dorsal oval; lateral spines are stout, well developed and articulate. Rostrum pointed at tip and extends beyond midlength of eyes. Eyes stout, not reaching distal margin of basal antennular segment; cornea dark, bulging and sub-terminal. Antennular peduncle extends only trifle beyond penultimate segment of antenna; terminal segment of antennule longer than second segment. Left cheliped I wanting; right cheliped I strong and unarmed. Chelae and carpi of chelipeds II mottled with white and yellow-brown; merus with tinge of yellow-brown distodorsally; fingers of cheliped II longer than palm. First abdominal segment bell-shaped; second segment large, being half as long as first one. Telson less than half length of last abdominal segment. Inner margin of exopod of uropod deeply concave; with well-developed truncate apically (not sharp spine) process near proximal end of posterior margin; endopod short and more or less triangular. SIZE. The total body length of the collected ♂ is 12 cm.	en	Ahmed, Quratulan, Ali, Qadeer Mohammad, Marin, Ivan N., Mubarak, Shumaila, Baloch, Ateeqa (2025): First record of Clausidium sarii (Copepoda: Clausidiidae) from the coastal waters of Pakistan, with the first description of the male and a new host. Arthropoda Selecta 34 (1): 41-50, DOI: 10.15298/arthsel.34.1.03
2A248796FFFDB170FC08BE89BAE7F494.taxon	description	HABITAT. The ghost shrimp was collected in a shallow intertidal area, hiding in the muddy sand under the small rock boulder.	en	Ahmed, Quratulan, Ali, Qadeer Mohammad, Marin, Ivan N., Mubarak, Shumaila, Baloch, Ateeqa (2025): First record of Clausidium sarii (Copepoda: Clausidiidae) from the coastal waters of Pakistan, with the first description of the male and a new host. Arthropoda Selecta 34 (1): 41-50, DOI: 10.15298/arthsel.34.1.03
2A248796FFFDB170FC08BE89BAE7F494.taxon	distribution	DISTRIBUTION. Widely distributed Indo-Western Pacific species, presently known from Mauritius (type locality), Chabahar Iran, Gulf of Oman, Pakistan (Northern Arabian Sea), Sri Lanka, southern Japan, Cocos Islands, Indonesia (Ambon) and Australia (Queensland).	en	Ahmed, Quratulan, Ali, Qadeer Mohammad, Marin, Ivan N., Mubarak, Shumaila, Baloch, Ateeqa (2025): First record of Clausidium sarii (Copepoda: Clausidiidae) from the coastal waters of Pakistan, with the first description of the male and a new host. Arthropoda Selecta 34 (1): 41-50, DOI: 10.15298/arthsel.34.1.03
2A248796FFFBB177FF7AB91EBDDDF73A.taxon	description	Figs 4 – 7. PV 2 - segmented and uniramous. Exopodal segment is elongated, with 2 pinnate setae along the outer margin, 1 small or vestigial naked subterminal seta and 1 long terminal pinnate apical seta. PVI with 2 setae. ADULT MALE (Figs 6, 7). Body cyclopiform in shape. Mean body length measured from frontal margin of cephalothorax to posterior length of urosomal segment about 1.5 – 1.9 mm (10 specimens measured). Thoracic somite I fused with the cephalothorax. Thoracic somite VI broader than long, posteriorly formed bilobed and not completely covered thoracic somite V. Prosome longer than urosome. Labrum expanded and broader than wider. Antenna I, antenna II, mandible, maxilla I and maxilla II are similar as in ♀♀. Maxilliped is modified for prehension with a large basal segment; lobe formed near inner edge of distal border of segment 1; segment 2 armed with a moveable process / claw with 3 blunt teeth. Abdomen with 4 segments: 1 genital segment, 2 abdominal segments and 1 anal somite. Anal somite clearly distinct from caudal rami on ventral side. Caudal furca as similar as in ♀♀. PI biramous as in ♀♀; endopodal segment 2 have 1 large pectinate stout seta and 2 small setae in replacement of blade like process and blunt median process as observed in PI female. 2 sucking disks present, with smaller distal disc have a bifurcate element. Armature formula for exopod I – 0; I – 0; III – 2 – 2. PpII – IV have only 1 inner seta on endopodal segment 2. Armature formula of PpII – IV as follows: PV is uniramous and shorter than PV in ♀♀. Exopodal segment with 4 well developed setae: 2 along the outer margin, 1 subterminal seta and 1 long terminal pinnate apical seta. PVI with 1 seta present on genital segment. HABITAT. The species was found living in the brachial cavity of the ghost shrimp Corallianassa martensi Miers, 1884 (Axiidea: Callichiridae), which represents a new host recorded for the species. Totally, 84 specimens were extracted from left and 39 specimens from right brachial cavity of the collected ghost shrimp. Previously, the species was recorded from the large chelipeds of the ghost shrimp Neocallichirus natalensis (Barnard, 1947) (Axiidea: Callichiridae) [Sepahvand et al., 2018].	en	Ahmed, Quratulan, Ali, Qadeer Mohammad, Marin, Ivan N., Mubarak, Shumaila, Baloch, Ateeqa (2025): First record of Clausidium sarii (Copepoda: Clausidiidae) from the coastal waters of Pakistan, with the first description of the male and a new host. Arthropoda Selecta 34 (1): 41-50, DOI: 10.15298/arthsel.34.1.03
2A248796FFFBB177FF7AB91EBDDDF73A.taxon	distribution	DISTRIBUTION. Gulf of Oman, Chabahar, Iran (type locality) and Pakistan (present study).	en	Ahmed, Quratulan, Ali, Qadeer Mohammad, Marin, Ivan N., Mubarak, Shumaila, Baloch, Ateeqa (2025): First record of Clausidium sarii (Copepoda: Clausidiidae) from the coastal waters of Pakistan, with the first description of the male and a new host. Arthropoda Selecta 34 (1): 41-50, DOI: 10.15298/arthsel.34.1.03
2A248796FFFBB177FF7AB91EBDDDF73A.taxon	discussion	REMARKS. The species has been previously known by a single holotype ♀ [Sepahvand et al., 2018]. The species could be referred to C. sarii by the specific distinguishing morphological features of free exopodal segment of PV, which is elongated and about 5 times longer than wide; the presence of 3 well developed and 1 vestigial seta on exopodal segment of PV in ♀♀, similar as illustrated by Sepahvand et al. [2018].	en	Ahmed, Quratulan, Ali, Qadeer Mohammad, Marin, Ivan N., Mubarak, Shumaila, Baloch, Ateeqa (2025): First record of Clausidium sarii (Copepoda: Clausidiidae) from the coastal waters of Pakistan, with the first description of the male and a new host. Arthropoda Selecta 34 (1): 41-50, DOI: 10.15298/arthsel.34.1.03
