A new species of Achelia (Pycnogonida: Ammotheidae) and first records of intertidal sea spiders found on Zoanthus (Cnidaria: Zoantharia) from Karachi Pakistan Author George, Zarish Center of Excellence in Marine Biology, University of Karachi, Karachi- 75270, Pakistan. Author Siddiqui, Ghazala Center of Excellence in Marine Biology, University of Karachi, Karachi- 75270, Pakistan. Author George, Nazish Center of Excellence in Marine Biology, University of Karachi, Karachi- 75270, Pakistan. Author Lucena, Rudá Amorim Programa de Pós-Graduação em Ciências Biológicas-Zoologia, Departamento de Sistemática e Ecologia / CCEN, Universidade Federal da Paraíba, João Pessoa, Paraíba, Brazil. & Laboratório de Invertebrados Paulo Young, Departamento de Sistemática e Ecologia / CCEN, Universidade Federal da Paraíba, João Pessoa, Paraíba, Brazil. text Zootaxa 2020 2020-07-31 4821 2 371 393 journal article 9175 10.11646/zootaxa.4821.2.9 bfd9d911-a63d-435b-b242-250ae7198298 1175-5326 4398801 696DAAA5-4CAF-4667-9229-1976830ACC2B Ammothella appendiculata ( Dohrn, 1881 ) ( Figure 5 ) Ammothea appendiculata Dohrn, 1881: 152–155 , pls. VII, figs. l–5. Material examined: ( CEMB , PYC– 015) 1♂ , Sandspit, 12. viii.2015 , on Zoanthus sansibaricus ; ( CEMB , PYC–016 ) 1♀ , Sandspit, 01.xii.2014 , on Zoanthus sansibaricus ; ( CEMB , PYC–017 ) 2♀ juvenile Sandspit, 28.ix.2015 on Zoanthus sansibaricus . Remarks: This species has previously been reported from Buleji and Manora, Karachi ( Gul & Ghani 2012 ), on littoral algae. It is reported from Sandspit for the first time on the Zoanthus colonies. Two juveniles were also collected with under-developed, 6-articled ovigers. Chela teeth and palps are well-developed. Ammothella appendiculata has wide morphological variation ( Stock 1955 ; Child 1992 ). Differences were observed between these specimens and the specimens described and illustrated by Döhrn (1881) , Stock (1955) and Child (1992) , such as the size of the ocular tubercle and the number of spines in the heel. Those specimens have a short ocular tubercle and four spines on the heel, while the present material has a slightly more-elongated ocular tubercle and three spines on the heel. An elongate ocular tubercle was reported by Stock (1955) and Müller & Krapp (2009) , and three heel spines were described by Marcus (1940) , Stock (1955) , Müller & Krapp (2009) , Lehman et al. (2014) . Distribution: Pakistan ( Gul & Ghani 2012 ), Gulf of Aqaba ( Stock 1957 ), Gulf of Naples ( Dohrn 1881 ), Hong Kong ( Bamber 1997 ), New Caledonia ( Bamber 2007b ), Pacific Panamá ( Stock 1975 ), Mediterranean Sea ( Stock 1958 ), Atlantic tropical and temperate ( Müller & Krapp 2009 ).