Pinworms (Nematoda: Thelastomatoidea) from Insects Collected in Mississippi, USA, with description of a new species of Protrellus Cobb, 1920 from the Cockroach Ischnoptera deropeltiformis Brunner von Wattenwyl, 1865 (Blattaria: Ectobiidae) Author Carreno, Ramon A. text Zootaxa 2018 2018-12-14 4531 4 567 577 journal article 27767 10.11646/zootaxa.4531.4.7 95e3edac-01b1-4514-86b6-a779859da335 1175-5326 2614935 722C5A9D-7241-43D5-A2B1-476E57CCD806 Protrellus browni n. sp. Description ( Figs. 1–3 ) Female (n = 21). Body robust, elongate, widest in mid-region. Body finely annulated, annules not prominent. Lateral alae absent. Oral annule with 8 looped labiopapillae ( Fig. 1C , 2B ). Amphids circular. Oral opening triradiate. Second annule not expanded, similar in dimensions to additional annules in head region. Esophageal corpus clavate; isthmus short, straight; basal bulb spherical with valvular apparatus ( Fig. 1B ). Nerve ring near mid-region of corpus. Excretory pore immediately anterior to vulvar opening. Vulva opening at start of lower third of corpus ( Figs. 1A,B ; 2A ). Didelphic, opisthodelphic. Vagina and uteri posteriorly directed, ovaries extending to level of anus before reflexing anteriorly. Eggs large, consisting of a broad round end and gradually tapering toward opposite pole which is more pointed. Broader half of egg having a small curved region bearing small spines in first third; spines limited to this region ( Fig. 3A ). One side of egg slightly flattened in lateral view. Eggs lacking gold, green, or yellow coloration. Tail short, conical ( Fig. 1A, D ). Measurements in Table 2 . Male (n=1). Small worms. Lateral alae absent ( Fig. 1E ). Head region slightly expanded. Esophagus with base of corpus slightly expanded, thin isthmus, and elongate bulb. Nerve ring near base of corpus. Testes containing amoeboid spermatozoa. Three pairs of caudal papillae present, including 1 pair subventral precloacal, 1 pair postcloacal adanal, and 1 pair in tail region. Tail subulate. Spicule present. Gubernaculum absent. Measurements inTable 2. TABLE 2. Morphometric measurements (in micrometers) for Protrellus browni n. sp. The mean and standard deviation are followed by range for female measurements.