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Comparative Morphology of the Stinger in Social Wasps (Hymenoptera: Vespidae)

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Comparative Morphology of the Stinger in Social Wasps (Hymenoptera: Vespidae) insects Article Comparative Morphology of the Stinger in Social Wasps (Hymenoptera: Vespidae) Mario Bissessarsingh 1,2 and Christopher K. Starr 1,* 1 Department of Life Sciences, University of the West Indies, St Augustine, Trinidad and Tobago; [email protected] 2 San Fernando East Secondary School, Pleasantville, Trinidad and Tobago * Correspondence: [email protected] Simple Summary: Both solitary and social wasps have a fully functional venom apparatus and can deliver painful stings, which they do in self-defense. However, solitary wasps sting in subduing prey, while social wasps do so in defense of the colony. The structure of the stinger is remarkably uniform across the large family that comprises both solitary and social species. The most notable source of variation is in the number and strength of barbs at the tips of the slender sting lancets that penetrate the wound in stinging. These are more numerous and robust in New World social species with very large colonies, so that in stinging human skin they often cannot be withdrawn, leading to sting autotomy, which is fatal to the wasp. This phenomenon is well-known from honey bees. Abstract: The physical features of the stinger are compared in 51 species of vespid wasps: 4 eumenines and zethines, 2 stenogastrines, 16 independent-founding polistines, 13 swarm-founding New World polistines, and 16 vespines. The overall structure of the stinger is remarkably uniform within the family. Although the wasps show a broad range in body size and social habits, the central part of Citation: Bissessarsingh, M.; Starr, the venom-delivery apparatus—the sting shaft—varies only to a modest extent in length relative to C.K. Comparative Morphology of the overall body size. What variation there is shows no apparent correlation with social habits. This Stinger in Social Wasps is consistent with the hypothesis that stinger size is constrained by the demands of a flight-worthy (Hymenoptera: Vespidae). Insects body. The sting lancets bear distinct, acute barbs in all examined species except in members of the 2021, 12, 729. https://doi.org/ Stenogastrinae. Barbs vary considerably among species in number, their summed lengths, and the 10.3390/insects12080729 relative degree of serration (summed length relative to lancet width). Where they are numerous and strong, it increases the likelihood of the stinger remaining fatally embedded in the skin of a vertebrate Academic Editors: Stephen A. Klotz and Justin O. Schmidt adversary (sting autotomy). Although an index that combines the number and strength of barbs is a more natural measure of overall serration, the number of barbs alone is almost as good a predictor of Received: 19 July 2021 the likelihood of sting autotomy. Across the family as a whole, the tendency to sting autotomy is Accepted: 5 August 2021 concentrated in the swarm-founding New World polistines. Published: 14 August 2021 Keywords: social wasps; sting autotomy; venom apparatus; Vespidae Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affil- iations. 1. Introduction The venom apparatus is the outstanding shared derived character of the aculeate hymenoptera, the large group that includes wasps, bees, and ants. It comprises a glandular– muscular component and a cuticular complex, the latter known as the sting or stinger [1] Copyright: © 2021 by the authors. (Figure1). Primitively, the venom apparatus serves in subduing prey, but in several lineages Licensee MDPI, Basel, Switzerland. it has taken on the important secondary function of defense of self and brood. In some of This article is an open access article these lineages, stinging no longer serves to subdue prey but is entirely defensive. distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/). Insects 2021, 12, 729. https://doi.org/10.3390/insects12080729 https://www.mdpi.com/journal/insects Insects 2021, 12, 729 2 of 10 Insects 2021, 12, x FOR PEER REVIEW 2 of 10 Figure 1. Venom apparatus of Ropalidia horni to show features common to the Vespidae. (A) Side view from the left of the Figureintact venom 1. Venom apparatus apparatus with of softRopalidia tissues horni removed to show except features for the common muscles to surroundingthe Vespidae. the (A venom) Side view sac. from (B) Side the viewleft of from the intact venom apparatus with soft tissues removed except for the muscles surrounding the venom sac. (B) Side view from the left of the stinger, with components in place but splayed. (C) Furcula in top view. (D) Tip of a lancet. Scale bar = 1 mm the left of the stinger, with components in place but splayed. (C) Furcula in top view. (D) Tip of a lancet. Scale bar = 1 mm for (A–C), approximately 0.1 mm for (D). DG = Dufour’s gland. F = furcula. OP = oblong plate. QP = quadrangular plate. for (A)–(C), approximately 0.1 mm for (D). DG = Dufour’s gland. F = furcula. OP = oblong plate. QP = quadrangular plate. SP = spiracular spiracular plate. SS = sting shaft. TP = triangular plat plate.e. VD = venom duct. VG = venom venom gland. VS = venom venom sac. sac. From From Macalintal and Starr [2]. [2]. After its synthesis in specialized glands, the venom is held in the venom sac (venom After its synthesis in specialized glands, the venom is held in the venom sac (venom reservoir) until it is expressed into the wound in the act of stinging or spraying. In some reservoir) until it is expressed into the wound in the act of stinging or spraying. In some lineages this is accomplished by means of muscles around the venom reservoir (the injection lineages this is accomplished by means of muscles around the venom reservoir (the injec- type of, e.g., Pompilidae and Vespidae), while in some others it is by means of valves on tion type of, e.g., Pompilidae and Vespidae), while in some others it is by means of valves the sting lancets (the valve-pump type of, e.g., Apoidea and Formicidae) [3]. on the sting lancets (the valve-pump type of, e.g., Apoidea and Formicidae) [3]. There are various ways that the venom apparatus can be enhanced as a more effective defensiveThere device are various or, alternatively, ways that the reduced venom in appara structuretus andcan be function enhanced [4,5 ].as Our a more focus effective here is defensiveon two parts device of the or, stinger. alternatively, In aculeates, reduced the in paired structure first valvulae,and function or lower [4,5]. valves,Our focus are long,here isfine on needles,two parts or of lancets the stinger. ((Figure In 6 aculeates, of [1]), [6, 7the]), thatpaired curve first down valvulae, and posteriorlyor lower valves, to the are tip long,of the fine stinger. needles, The secondor lancets valvulae, ((Figure or 6 upper of [1]), valves, [6,7]), are that fused curve dorsally down in and most posteriorly aculeates to to theform tip the of much the stinger. broader The sting second shaft, whichvalvulae, envelops or upper the lancetsvalves, andare withinfused dorsally which they in movemost aculeatesposterior–anteriorly to form the in much the course broader of stinging.sting shaft, These which two envelops components the lancets can be regardedand within as whichthe “business they move end” posterior–anteriorly of the venom apparatus, in the whichcourse penetrateof stinging. the These prey/victim, two components while all canother be components regarded as are the servo-mechanisms “business end” toof theirthe venom functioning. apparatus, The length which of thepenetrate sting shaft the prey/victim,relative to overall while body all other size providescomponents a convenient are servo-mechanisms index of relative to physicaltheir functioning. investment The in lengththe venom of the apparatus. sting shaft relative to overall body size provides a convenient index of rela- tive physicalThe tip ofinvestment each lancet in often the venom has a series apparatus. of distinct, anterior-directed (i.e., away from the lancetThe tip) tip barbs. of each In lancet his pioneering often has microanatomical a series of distinct, study anterior-directed of the honey bee (i.e.,Apis away mellifera from, theJan Swammerdamlancet tip) barbs. ([8] page In his 199, pioneerin Table XVIII)g microanatomical clearly figured the stud lancety barbsof the (Figure honey2) andbee Apisrelated mellifera them, to Jan the Swammerdam well-known phenomenon ([8] page 199, of Table sting XVIII) autotomy. clearly In this,figure thed stingerthe lancet becomes barbs (Figureirrecoverably, 2) and related fatally embeddedthem to the in well-known the skin when phenomenon stinging a of human sting autotomy [9,10]. Snodgrass. In this, [the11] stingerattributed becomes to the irrecoverably, barbs an anchoring fatally functionembedded as in the the lancets skin when in turn stinging penetrate a human deeper [9,10]. into Snodgrass [11] attributed to the barbs an anchoring function as the lancets in turn pene- trate deeper into the wound. The venom apparatus has been studied in the various species Insects 2021, 12, x. https://doi.org/10.3390/xxxxx www.mdpi.com/journal/insects Insects 2021, 12, 729 3 of 10 Insects 2021, 12, x FOR PEER REVIEW 3 of 10 theof honey wound. bees The (Apis venom spp.), apparatus all virtually has identical been studied in overall in the structure various with species 10–11 of honeyacute barbs bees (perApis lancetspp.), [12]. all virtually identical in overall structure with 10–11 acute barbs per lancet [12]. Figure 2. Terminal part of a sting lancet in the western honey Apis mellifera bee to illustrate the Figure 2. Terminal part of a sting lancet in the western honey Apis mellifera bee to illustrate the number and strength of the barbs. It has a very high serration index (defined in the text) of Sr = 2.43.
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